Control mechanism for diesel engines



Jan. 12, 1937. LOEFFLER 2,067,611

CONTROL MECHANISM FOR DIESEL ENGINES Filed June 4, 1935 3 Sheets-Sheet l Jan. 12, 1937. ,3, L E F R 2,067,611

CONTROL MECHANISM FOR DIESEL ENGINES Filed June 4,1955 3 Sheets-Sheet 2 fi 2 I 1 14 13 16 19? M 31 min! 5 7 21 Z? M 32 Wm 14- n I 2 11 K A on 11711111! I IlIIIllIIIlIII/li INVENTOR. Breuwlaeffler,

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ATTORNEYS 13.11.12, 1937. LQEFFLER 2,067,611

CONTROL MECHANISM FOR DIESEL ENGINES Filed June 4, 1935 3 Sheets-Sheet 3 T-I J MW .53

f If ls I INVENTOR. firanolme/Ilar,

/5 ATTORNEY/S Patented Jan. 12, 1937 UNITED STATES PATENT OFFICE CONTROL MECHANISM FOR DIESEL ENGINES Application June 4, 1935, Serial No. 24,825

Claims.

The present invention relates to control mechanisms for internal combustion engines and embodies, more specifically, an improved control mechanism by means of which the operation of Diesel engines may be effectively controlled.

Certain types of Diesel engines are provided with combustion chambers which communicate with the cylinders and within which combustion initially takes place. In addition to these combustion chambers air chambers are provided in communication with the combustion chambers in order that during normal operation of the engine a sufficient volume of air and fuel may be received within these chambers to produce a desired combustion which improves the operation of the engine. In engines of the above character, it is desirable in the starting thereof to shut ofi the air chamber from the combustion chamber in order that the effective space within which the gases are compressed may be decreased, thus increasing the compression during the starting operation. Moreover, in cranking the engine it is desirable to prevent the building up of substantial compression until the inertia elements have attained a suitable speed and to this end valves have been provided for opening the combustion and air chambers to the atmosphere during the cranking operation.

To accomplish the foregoing steps in the operationof such Diesel engines, valves have heretofore been provided which have three positions, viz; an open position during which the gases within the combustion and air chambers may pass into the atmosphere, a position in which the valve is closed against one seat to subject only the compression chamber to the compression in the cylinder, and a third position in which the! valve is closed against a second seat to subject the combustion and air chambers to the compression within the cylinder. These valves have been manually operated, each valve being separately operated and adjusted from the others of the engine.

It is an object of the present invention to provide a control mechanism by means of which the foregoing valves may be effectively operated from a relatively remote position.

A further object of the invention is to provide a control mechanism of the above character wherein all of the valves of an engine may be simultaneously and effectively operated to maintain them in desired positions.

A further object of the invention is to provide a convenient and efiective mechanism by means of which the above valves may be operated to actuate the same properly without requiring the exercise of skill in causing the valves to be properly positioned in their various positions.

Further objects, not specifically enumerated above, will be apparent as the invention is described in greater detail in connection with the accompanying drawings, wherein:

Figure l is a view in front elevation, showing a control mechanism constructed in accordance with the present invention.

Figure 2 is a view in transverse section, taken on line 2-2 of Figure 1, and looking in the direction of the arrows.

Figure 3 is a view in longitudinal section, taken on the line 3-3 of Figure 2, and looking in the direction of the arrows.

Figure 4 is a view in end elevation, showing the manually operated portion of the mechanism of Figure 1.

Figure 5 is a plan view showing the guide plate of the manually operated member.

Figure 6 is a segmental view, similar to Figure 2, showing the valve seated in its second position.

Figure '7 is a view similar to Figure 6, showing the valve in its intermediate or open position.

Figure 8 is a detail view in section showing a portion of the valve actuating mechanism.

Figure 9 is a view similar to Figure 2 showing a modified form of the invention.

Figure 10 is a view similar to Figure 9 showing a further modification of the invention.

' With reference to the construction shown in Figures 1 through 8, the engine structure which forms the combustion and air chambers is shown at l l the combustion chamber being indicated at I2 and the air chamber at l3. Between these chambers a valve seat 14 is formed against which a valve [5 is adapted to be seated. The valve I5 is formed with a seat 16 which is'adapted to engage the seat M, a stream lined nose I! being formed on the valve to facilitate fluid fiow under certain conditions.

A plate I8 is secured to the engine structure Upon the plate l6, a sleeve 23 is formed, the sleeve being provided with diagonally disposed lugs 24 which are adapted to be engaged by cooperating cams 25 which are formed upon a bonnet 26, received over the sleeve 23. Upon rotation of the bonnet 26 with respect to the sleeve 23 the surfaces of the cams 25 engage the lugs 24 and causelthe valve to be moved into the position shown in Figure 6. Motion of the bonnet is transmitted to the valve stem l9 through opposed springs 2'! and nut 28 which is threaded to the end of stem l9. By means zoi'ithe springs to the valve stem 19. connected to a plug 30 which is slidably received in a housing 3| and centered therein by The aperture,33.in.

means of opposed springs 32. the housing 3| permits relative motion to take place -between the endmof ithe arm 29 and the housingz3 i111. In this fashion,.the springs 32 permit relative motion between the arm 29 and h-ousinga3liiyieldinglyand the valve may thus be firmly seated without requiring an exact motion of. :the housing. 3.!

As seen in Figure. l, the housing 3| forms part of a'zconnectingrod 32 which is'prov'ided at one endzwitha transverse etrack-or box 33.' An actuating lever 34 is mountedfor universal motion ats35 upon az relatively stationary element and is provided with: a lower extremity 36,. upon which a ball 31 is formed. The-.ball 31.is adapted to move-within:the boxontrack 33 and thus transmit longitudinal motion:.of': the lever 34 to the connecting rod 32. Such? longitudinal motion tak'esplacewhenfith'e lever 34 moves from its position as shown in Figure l'to the dot'and dash positions indicated by II and causes the arms 29 to :be movedainto the dot 1 and i dash positions shown. This relative rotationzcauses the bonnet 26 toadvance thejvalve l5iinto the closed positi'on.-shownxin Figure- 6, at which time the-air chamber I3 is out of communication with the combustion-chamber l2 and the. starting operation -takesplacesr i Motiontotfitheyalve into its third'or running positionefiectedrby-means ofyoke 38 which'is provided with fingers- 33 adapted to engage a groove 40, formed iuponthebonnet 26. The yoke 38Liis formedrupon a sleeve 4| which is journaled upon the engine-by means of brackets-42; Each endiriofz' th'e sleeve is formed with cylindrical bushings 43; the inner surfaces ofwhich. are

'splinedtorecei-ve'thesplined'ends 44 of arotata ble shaft:45.i Shaft 45 is connected to the lever 345: in a. plane. passing through the axis of the connection 35 in. order that transverse motion ofthe lever 34-:maysb'e imparted to'th'e shaft'45l "Ihistransverse'motion of the lever 34 takes place-whenthe.leverr moves from the position marked. III I to; the position marked II in Figure 4. During such transversemotion;the'connectingtrod32f'isnot actuated" by reason of the track or box.- formation 33. Such transverse motion, however; rocks the shaft 45 and causes the yoke 3li 'ito move the bonnet 26 outwardlyand seat the: valve seat 2l:.=against the seat 26, as shown in. Figure 2.

The intermediate position marked I in Figures 4 and 5 is shown in Figure 7, wherein gas may pass: around the: valve l5 and escape through the passages. 22.v This position is used during the; cranking: operation in order that the inertia elements may be brought :up. to--speed.-

tension 41 having interior threads 48 formed therein. The threads are adapted to receive a ,threaded sleeve 49 which is mounted over the ""stem l9 and which is formed with a pinion 5i] adapted to engage a rack 5|, connected to the rod? 32. This mechanism is housed within a bonnet-r52 and includes opposed springs 53 and 54 fwhiclrztransmit motion between the pinion 5il'andathe'valvestern l9. It will thus be seen that axial motion of the rack 5| will cause the threaded member to be advanced or retracted I axiallyand thus move the valve l5 into any of its desired positions.

.In- Figure 10 :a further-modification is shown whereiniaplate 55 .rserves assaclosure for the air chamberandicarries.thezvalvestem 19. The

endhof :this. valve .stemis connected to a fitting. 56 upon .which1arm '51 isformed. The fitting is received 'within1a: sleeve. 58," formed on the. plate 55;: the. :fitting 56 :and: sleeve :58rfbeing.v threadedly engaged. by means ;of thethread formations 59. Uponmotion of the arm 5l,'the fittingx56 is movediwith respect :to :the :sleeve -58 r actuate.

thez'valve in a desired manner; Springs 60- and El servev to permit a degree of'yielding motion betweenvthe valve stempl9'tandpthe fitting 56 in order thatthe valvermay be seated eflectively in either. of .two positions.

While the invention has "been, described: with specific reference to the taccompanying.tdravvings, it F isnot: to bealimited; save as defined in the appended claims:

I claim:

1. Valve mechanism: comprising a valve and valve stem having a-plurality of operatingpositions; a' remote. manually;- operable mechanism; and 1, a plurality of 'meansx. to move the: valve stem by the last'namedmechanism;

2. Valve mechanism' comprisinga valve and valve stem having 'a plurality of operatingpositions, a remote manually operable-mechanism, a .bonnet rotatably connected :to the stem, means to turn the bonnet by the manual mechanism and move the .same axially; and. separate means to move *the bonnet andzstem axially by the manual .mechanism.

3. valveimechanism comprising a; valve and valve stem havinga plurality of operating positions, a remotexmanually operablemechanism', axbonnetrotatablyconnected to the stem, and yieldingly movable axially with respect thereto, meansto turnxthe bonnet by themanual-mech-e anism'and move the same .axially, and separate. means to move the bonnet and stem. axiallyby the manual mechanism;

4. Valve mechanism comprising a. valve and valve'stem havingra plurality of operating positions, remote manually operable mechanism, a bonnet rotatably connected to the stem, a rock shaft connectedxto the manual. mechanism to be rocked thereby, means to connect the rock shaft to the bonnet to move the-bonnet and stem axially, a connecting rod connected to the manual mechanism to be moved axially thereby, means to connect the connecting rod to the bonnet to tum the same orr its axis, and means to move the bonnet and stem'axially upon turning of the bonnet.

5. Valve mechanism comprising a valve and valve stem having a plurality of operating positions, remote manually operable mechanism, a bonnet rotatably connected to the stem, a rock shaft connected to the manual mechanism to be rocked thereby, means to connect the rock shaft to the bonnet to move the bonnet and stem axially, a connecting rod connected to the manual mechanism to be moved axially thereby, a lever on the bonnet, yielding means to connect the lever to the connecting rod, and means to move the bonnet and stem axially upon turning of the bonnet.

6. Valve mechanism comprising a valve and valve stem having a plurality of operating posi tions, a plate upon which the stem is mounted with provision for axial motion, a sleeve on the plate concentric with the stem, a bonnet over the sleeve and connected to the stem with provision for rotation with respect thereto, means between the bonnet and sleeve to move the bonnet axially with respect to the sleeve upon rotation of the bonnet with respect to the sleeve, a remote manually operable mechanism, and means to move the bonnet axially by the manual mechanism.

'7. Valve mechanism comprising a. valve and valve stem having a plurality of operating positions, a plate upon which the stem is mounted with provision for axial motion, a sleeve on the plate concentric with the stem, a bonnet over the sleeve and connected to the stem with provision for rotation with respect thereto, means between the bonnet and sleeve to move the bonnet axially with respect to the sleeve upon rotation of the bonnet with respect to the sleeve. a remote manually operable mechanism and a plurality of means to move the bonnet axially by the manual mechanism.

8. Valve mechanism comprising a valve and valve stem having a plurality of operating positions, a plate upon which the stem is mounted with provision for axial motion, a sleeve on the plate concentric with the stem, a bonnet over the sleeve and connected to the stem with provision for rotation wih respect thereto, means between the bonnet and sleeve to move the bonnet axially with respect to the sleeve upon rotation of the bonnet with respect to the sleeve, a remote manually operable mechanism, means to move the bonnet and valve into two positions by the manual mechanism, and separate means to move the valve into a third position by the manual mechanism.

9. Valve mechanism comprising a valve and valve stem having a plurality of operating positions, a plate upon which the stem is mounted with provision for axial motion, a sleeve on the plate concentric with the stem, a bonnet over the sleeve and connected to the stem with provision for rotation with respect thereto, means between the bonnet and sleeve to move the bonnet axially with respect to the sleeve upon rotation of the bonnet with respect to the sleeve, a'

plate concentric with the stem, a bonnet over the sleeve and connected to the stem with pro.- vision for rotation with respect thereto. means between the bonnet and sleeve to move the bonnet axially with respect to the sleeve upon rotation of the bonnet with respect to the sleeve, a 9

remote manually operable mechanism a rock shaft connected to the bonnet and manual mechanism to move the bonnet and stem into two positions, a connecting rod connected to the bonnet and manual mechanism to move the bonnet and stem into a third position, and yielding means between the connecting rod and the bonnet.

BRUNO LOEFFLER. 

